Track time spent in games.

Install BetterDiscord from here https://github.com/BetterDiscord/Installer/releases
Reminder: BetterDiscord is against the TOS, use at your own risk!

Download the plugin: https://raw.githubusercontent.com/Yentis/betterdiscord-game-time-tracker/master/GameTimeTracker.plugin.js
(Right-click -> Save as...)

Open Discord -> Settings -> Plugins -> Open plugin folder and place the plugin there.
Enable it in the Plugins menu and hit Ctrl + R.

Using this plugin any game activity will be tracked and the time spent will be stored.